{"id":7899,"date":"2018-08-04T01:02:52","date_gmt":"2018-08-03T17:02:52","guid":{"rendered":"https:\/\/www.zhangxinxu.com\/wordpress\/?p=7899"},"modified":"2018-12-06T22:26:20","modified_gmt":"2018-12-06T14:26:20","slug":"js-base64-atob-btoa-encode-decode","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2018\/08\/js-base64-atob-btoa-encode-decode\/","title":{"rendered":"\u539f\u6765\u6d4f\u89c8\u5668\u539f\u751f\u652f\u6301JS Base64\u7f16\u7801\u89e3\u7801"},"content":{"rendered":"

by zhangxinxu<\/a> from https:\/\/www.zhangxinxu.com\/wordpress\/?p=7899<\/a>
\n\u672c\u6587\u53ef\u5168\u6587\u8f6c\u8f7d\uff0c\u4f46\u9700\u5f97\u5230\u539f\u4f5c\u8005\u4e66\u9762\u8bb8\u53ef\uff0c\u540c\u65f6\u4fdd\u7559\u539f\u4f5c\u8005\u548c\u51fa\u5904\uff0c\u6458\u8981\u5f15\u6d41\u5219\u968f\u610f\u3002<\/p>\n

\u4e00\u3001\u57fa\u7840\u4e0d\u7262\uff0c\u9009\u578b\u7cdf\u7cd5<\/h3>\n

\"JS<\/p>\n

\u7cdf\u7cd5\u7684\u6280\u672f\u9009\u578b\u5f80\u5f80\u6e90\u81ea\u81ea\u8eab\u6280\u672f\u5e7f\u5ea6\u4e0d\u8db3\u3002<\/p>\n

\u5c31\u5728\u6570\u6708\u524d\uff0c\u4e00\u4e2a\u524d\u7aefHTML\u5b57\u7b26\u4fe1\u606f\u8f6cBase64\u7684\u9700\u6c42\uff0c\u6211\u662f\u6beb\u4e0d\u72b9\u8c6b\u53bb\u627e\u4e86\u4e2a\u5f00\u6e90\u7684base64.js<\/a>\u3002<\/p>\n

\u4f7f\u7528\u5f88\u7b80\u5355\uff0c\u6d4f\u89c8\u5668\u5f15\u5165\u8be5JS\u6587\u4ef6\uff0c\u7136\u540eBase64\u7f16\u7801\u8fd9\u6837\uff1a<\/p>\n

Base64.encode('zhangxinxu');\r\n\/\/ \u8fd4\u56de\uff1a'emhhbmd4aW54dQ=='<\/span><\/pre>\n
\u89e3\u7801\u5c31\u8c03\u7528decode<\/code>\u65b9\u6cd5\uff0c\u5982\u4e0b\uff1a<\/p>\n
Base64.decode('emhhbmd4aW54dQ==');\r\n\/\/ \u8fd4\u56de\uff1a'zhangxinxu'<\/span><\/pre>\n
\u6570\u636e\u51c6\u786e\uff0c\u529f\u80fd\u826f\u597d\u3002\u5f53\u65f6\u5f04\u5b8c\u8fd8\u6d0b\u6d0b\u5f97\u610f\uff0c\u4ee5\u4e3a\u662f\u4e2a\u5b8c\u7f8e\u7684\u89e3\u51b3\u3002<\/p>\n
\u7ed3\u679c\uff0c\u4eca\u5929\u53d1\u73b0\uff0c\u5c3c\u739b\u539f\u6765\u6d4f\u89c8\u5668\u5f88\u65e9\u5c31\u652f\u6301\u4e86JS Base64\u52a0\u5bc6\u89e3\u5bc6\uff0c\u800c\u4e0a\u9762\u8fd9\u79cd\u6d0b\u6d0b\u5f97\u610f\u7684\u505a\u6cd5\u5b8c\u5168\u5c31\u662f\u778e\u5b50\u70b9\u706f\u2014\u2014\u767d\u8d39\u8721\uff01\u6839\u672c\u5c31\u4e0d\u662f\u4e00\u4e2a\u597d\u7684\u6280\u672f\u9009\u578b\u3002<\/p>\n
\u7531\u4e8e\u6280\u672f\u5e7f\u5ea6\u638c\u63e1\u4e0d\u8db3\uff0c\u6216\u8005\u8bf4JS\u57fa\u7840\u638c\u63e1\u4e0d\u7262\uff0c\u5bfc\u81f4\u6d6a\u8d39\u4e86\u5927\u628a\u65f6\u95f4\u53bb\u627eBase64\u7684JS\u8bed\u8a00\u5e93\uff0c\u5b66\u4e60\u5176API\u7528\u6cd5\uff0c\u6362\u6765\u4e00\u4e2a\u5197\u4f59\u5b8c\u5168\u4e0d\u9700\u8981\u52a0\u8f7d\u7684JS\uff0c\u73b0\u5728\u6765\u770b\uff0c\u771f\u662f\u4e2a\u7cdf\u7cd5\u7684\u6280\u672f\u9009\u578b\u3002<\/p>\n
\u4e8c\u3001\u539f\u751fatob\u548cbtoa\u65b9\u6cd5<\/h3>\n
\u5b9e\u9645\u4e0a\uff0c\u4eceIE10+\u6d4f\u89c8\u5668\u5f00\u59cb\uff0c\u6240\u6709\u6d4f\u89c8\u5668\u5c31\u539f\u751f\u63d0\u4f9b\u4e86Base64\u7f16\u7801\u89e3\u7801\u65b9\u6cd5\uff0c\u4e0d\u4ec5\u53ef\u4ee5\u7528\u4e8e\u6d4f\u89c8\u5668\u73af\u5883\uff0cService Worker\u73af\u5883\u4e5f\u53ef\u4ee5\u4f7f\u7528\u3002<\/p>\n
\u65b9\u6cd5\u540d\u5c31\u662fatob<\/code>\u548cbtoa<\/code>\uff0c\u5177\u4f53\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n
1. Base64\u89e3\u7801<\/h4>\n
\u8bed\u6cd5\u4e3a\uff08\u6d4f\u89c8\u5668\u4e2d\uff09\uff1a<\/p>\n
var decodedData = window.atob(encodedData);<\/pre>\n
\u6216\u8005\uff08\u6d4f\u89c8\u5668\u6216js Worker\u7ebf\u7a0b\u4e2d<\/a>\uff09\uff1a<\/p>\n
var decodedData = self.atob(encodedData);<\/pre>\n
\u4f8b\u5982\uff1a<\/p>\n
window.atob('emhhbmd4aW54dQ==');\r\n\/\/ \u8fd4\u56de\uff1a'zhangxinxu'<\/span><\/pre>\n
\u773c\u89c1\u4e3a\u5b9e\uff0c\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1awindow.atob\u89e3\u7801Base64\u5b57\u7b26demo<\/a><\/p>\n
\u7ed3\u679c\u5982\u4e0b\u56fe\uff1a<\/p>\n
\"window.atob\u8f93\u51fa\u7ed3\u679c\"<\/p>\n
\u8bb0\u4f4fatob<\/strong>
\natob<\/code>\u8fd9\u4e2a\u65b9\u6cd5\u540d\u79f0\u4e4d\u4e00\u770b\uff0c\u5f88\u5947\u602a\uff0c\u4e0d\u77e5\u9053\u8fd9\u4e2a\u5355\u8bcd\u4ec0\u4e48\u610f\u601d\u3002\u6211\u4eec\u53ef\u4ee5\u7406\u89e3\u4e3a A to B\uff0c\u4e5f\u5c31\u662f\u4eceA\u5230B\u3002\u8fd9\u91cc\u7684B\u6307\u7684\u5c31\u662fBase64\u5417\uff1f\u54c8\u54c8\u54c8\uff0c\u606d\u559c\u4f60\uff01\u731c\u9519\u4e86\uff01A\u6307\u7684\u624d\u662fBase64\uff0c\u53cd\u7684\uff0cB\u624d\u662f\u666e\u901a\u5b57\u7b26\uff0c\u666e\u901a\u610f\u601d\u5c31\u662flow\uff0c\u4fd7\u79f0low B\u3002\u6240\u4ee5\u6211\u4eec\u8fd9\u4e48\u8bb0\u5fc6\uff0cLow B\uff0cLow B\uff0cB\u8868\u793a\u5f88Low\u7684\u666e\u901a\u5b57\u7b26\uff0cA\u624d\u662fBase64\uff0c\u548c\u9996\u5b57\u6bcd\u5bf9\u5e94\u5173\u7cfb\u662f\u53cd\u7684\u3002<\/p>\n
\u56e0\u6b64\uff0catob\u8868\u793aBase64\u5b57\u7b26to\u666e\u901a\u5b57\u7b26\uff0c\u4e5f\u5c31\u662fBase64\u89e3\u7801\u3002<\/p>\n
2. Base64\u7f16\u7801<\/h4>\n
\u8bed\u6cd5\u4e3a\uff08\u6d4f\u89c8\u5668\u4e2d\uff09\uff1a<\/p>\n
var encodedData = window.btoa(stringToEncode);<\/pre>\n
\u6216\u8005\uff08\u6d4f\u89c8\u5668\u6216js Worker\u7ebf\u7a0b\u4e2d<\/a>\uff09\uff1a<\/p>\n
var encodedData = self.btoa(stringToEncode);<\/pre>\n
\u4f8b\u5982\uff1a<\/p>\n
window.btoa('zhangxinxu');\r\n\/\/ \u8fd4\u56de\uff1a'emhhbmd4aW54dQ=='<\/span><\/pre>\n
\u773c\u89c1\u4e3a\u5b9e\uff0c\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1awindow.btoa\u7f16\u7801\u5b57\u7b26\u4e3aBase64 demo<\/a><\/p>\n
\u7ed3\u679c\u5982\u4e0b\u56fe\uff1a<\/p>\n
\"window.btoa\u7f16\u7801\u540e\u7684\u5b57\u7b26\"<\/p>\n
\u8bb0\u4f4fbtoa\u65b9\u6cd5<\/strong>
\nbtoa<\/code>\u8fd9\u4e2a\u65b9\u6cd5\u540d\u79f0\u4e4d\u4e00\u770b\uff0c\u5f88\u5947\u602a\uff0c\u4e0d\u77e5\u9053\u8fd9\u4e2a\u5355\u8bcd\u4ec0\u4e48\u610f\u601d\u3002\u6211\u4eec\u53ef\u4ee5\u7406\u89e3\u4e3a B to A\uff0c\u4e5f\u5c31\u662f\u4eceB\u5230A\u3002\u90a3B\u6307\u4ec0\u4e48\uff0cA\u6307\u4ec0\u4e48\u5462\uff1f\u548catob<\/code>\u65b9\u6cd5\u4e00\u6837\uff0cB\u6307\u7684\u662flow B\u666e\u901a\u5b57\u7b26\u4e32\uff0cA\u6307\u7684\u662fBase64\u5b57\u7b26\u3002<\/p>\n
\u56e0\u6b64\uff0cbtoa<\/code>\u65b9\u6cd5\u8868\u793alow B\u666e\u901a\u5b57\u7b26to Base64\u5b57\u7b26\uff0c\u4e5f\u5c31\u662fBase64\u7f16\u7801\u3002<\/p>\n
\u8865\u5145\u4e8e2018-08-09<\/strong>
\n\u6709\u4eba\u63d0\u5230\u4e2d\u6587Base64\u6570\u636e\u8f6c\u6362\u4f1a\u6709\u62a5\u9519\u95ee\u9898\u3002<\/p>\n
\u9519\u8bef\u5982\u4e0b\uff1a<\/p>\n
The string to be encoded contains characters outside of the Latin1 range<\/p><\/blockquote>\n
\u96fe\u971c\u6708\u540c\u5b66\u63d0\u51fa\u4e86\u89e3\u51b3\u65b9\u6cd5\uff0c\u5c31\u662f\u4e2d\u6587\u5148encode\u8f6c\u7801\u548cdecode\u7f16\u7801\uff1a<\/p>\n
window.btoa(window.encodeURIComponent('\u563b\u563b\u54c8\u54c8\u54c8\u54c8\u5566\u5566\u5566\u5566'));\r\nwindow.decodeURIComponent(window.atob('JUU1JTk4JUJCJUU1JTk4JUJCJUU1JTkzJTg4JUU1JTkzJTg4JUU1JTkzJTg4JUU1JTkzJTg4JUU1JTk1JUE2JUU1JTk1JUE2JUU1JTk1JUE2JUU1JTk1JUE2'));<\/pre>\n
\u6211\u81ea\u5df1\u641c\u7d22\u4e86\u4e0b\uff0c\u53ef\u4ee5\u8bd5\u8bd5\u4e0b\u9762\u8fd9\u6837\uff1a<\/p>\n
btoa(unescape(encodeURIComponent(str)))<\/pre>\n
\u6211\u7528SVG\u4ee3\u7801\u6d4b\u8bd5\u662fOK\u7684\u3002<\/p>\n
\u4e09\u3001IE8\/IE9\u7684polyfill<\/h3>\n
\u5f53\u4e0b\uff0c\u4ecd\u6709\u4e0d\u5c11PC\u9879\u76ee\u8fd8\u9700\u8981\u517c\u5bb9IE9\uff0c\u6240\u4ee5\uff0c\u6211\u4eec\u53ef\u4ee5\u4e13\u95e8\u9488\u5bf9\u8fd9\u4e9b\u6d4f\u89c8\u5668\u518d\u5f15\u5165\u4e00\u6bb5ployfill\u811a\u672c\u6216\u8005\u4e00\u4e2aJS\u6587\u4ef6\u5373\u53ef\u3002<\/p>\n
ployfill JS\u811a\u672c\u6233\u8fd9\u91cc<\/a>\uff0c\u6216\u8005\u76f4\u63a5\u53f3\u952e\u8fd9\u91cc<\/a>\u4e0b\u8f7d\u6e90\u6587\u4ef6\uff01<\/p>\n
\u5b9e\u9645\u4f7f\u7528\uff0c\u6211\u4eec\u53ef\u4ee5\u501f\u52a9IE\u6761\u4ef6\u6ce8\u91ca\u65e0\u7f1d\u5bf9\u63a5\u3002<\/p>\n
\u4e5f\u5c31\u662fHTML\u4e2d\u5d4c\u5165\u4e0b\u9762\u4e00\u6bb5\u4ee3\u7801\uff1a<\/p>\n
<!--[if IE]>\r\n<script src=\".\/base64-polyfill.js\"><\/script>\r\n<![endif]--><\/pre>\n
[if IE]<\/code>\u8868\u793a\u6240\u6709IE\u6d4f\u89c8\u5668\uff0c\u7531\u4e8eIE10+\u6d4f\u89c8\u5668\u5df2\u7ecf\u653e\u5f03\u4e86\u8457\u540d\u7684IE\u6761\u4ef6\u6ce8\u91ca\u7684\u652f\u6301\uff0cChrome\u7b49\u6d4f\u89c8\u5668\u672c\u8eab\u5c31\u4e0d\u652f\u6301\u8fd9\u4e2aIE\u79c1\u6709\u8bed\u6cd5\uff0c\u56e0\u6b64\uff0c\u5f88\u5929\u7136\u7684\uff0c\u4e0a\u9762\u4e00\u6bb5script\u5f15\u5165\u53ea\u5728IE9-\u6d4f\u89c8\u5668\u4e0b\u6709\u6548\u3002\u800c\u6211\u4eec\u672c\u6765\u5c31\u5e0c\u671b\u53eaIE8\uff0cIE9\u6d4f\u89c8\u5668\u5f15\u5165ployfill\uff0c\u4e8e\u662f\u6b63\u597d\u5b8c\u7f8e\u8854\u63a5\u4e0a\u3002<\/p>\n
\u4e5f\u5c31\u662f\u539f\u751f\u652f\u6301atob\u548cbtoa\u65b9\u6cd5\u7684\u6d4f\u89c8\u5668\u8ba4\u4e3a\u5c31\u662f\u4e00\u6bb5\u65e0\u9700\u5173\u5fc3\u7684HTML\u6ce8\u91ca\uff0c\u4e0d\u652f\u6301atob\u548cbtoa\u7684IE9\u53ca\u5176\u4ee5\u4e0b\u6d4f\u89c8\u5668\u5219\u4f1a\u52a0\u8f7d\u6211\u4eec\u7684base64-polyfill.js\uff0c\u4f7f\u6d4f\u89c8\u5668\u4e5f\u652f\u6301window.btoa<\/code>\u548cwindow.atob<\/code>\u8fd9\u4e2a\u8bed\u6cd5\u3002<\/p>\n
\u773c\u89c1\u4e3a\u5b9e\uff0c\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1abtoa\/atob Base64\u7f16\u7801\u89e3\u7801polyfill demo<\/a><\/p>\n
\u5728Chrome\u6d4f\u89c8\u5668\u4e0b\uff0c\u53ef\u4ee5\u770b\u5230\u6ca1\u6709polyfill\u76f8\u5173JS\u7684\u52a0\u8f7d\uff1a<\/p>\n
\"JS\u7f51\u7edc\u8bf7\u6c42-\u6ca1\u6709polyfill\u76f8\u5173JS\"<\/p>\n
\u800cIE8\u539f\u751f\u4e0d\u652f\u6301atob\u548cbtoa\u65b9\u6cd5\u7684\u6d4f\u89c8\u5668\u4e5f\u6b63\u5e38\u7f16\u7801\u89e3\u7801Base64\u5b57\u7b26\u4e86\uff0c\u5982\u4e0b\u622a\u56fe\uff1a<\/p>\n
\"IE8\u4e0b\u7684Base64\u7f16\u7801\u89e3\u7801\u6548\u679c\u622a\u56fe\"<\/p>\n
\u56db\u3001\u4efb\u610f\u6587\u4ef6Base64\u7f16\u7801<\/h3>\n
\u501f\u52a9FileReader<\/code>\u5bf9\u8c61\u548creadAsDataURL<\/code>\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u628a\u4efb\u610f\u7684\u6587\u4ef6\u8f6c\u6362\u4e3aBase64 Data-URI\u3002\u5047\u8bbe\u6211\u4eec\u7684\u6587\u4ef6\u5bf9\u8c61\u662ffile<\/code>\uff0c\u5219\u8f6c\u6362\u7684JavaScript\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
var reader = new FileReader();\r\nreader.onload = function(e) {\r\n  \/\/ e.target.result\u5c31\u662f\u8be5\u6587\u4ef6\u7684\u5b8c\u6574Base64 Data-URI<\/span>\r\n};\r\nreader.readAsDataURL(file);<\/pre>\n
\u57fa\u4e8e\u6b64\u539f\u7406\uff0c\u6211\u7279\u610f\u505a\u4e86\u4e2a\u7b80\u6613\u5c0f\u5de5\u5177\uff0c\u53ef\u4ee5\u5f97\u5230\u4efb\u610f\u6587\u4ef6\u7684Base64 Data-URI\uff0c\u5de5\u5177\u6233\u8fd9\u91cc\uff1abase64.html<\/a><\/p>\n
\u628a\u5bf9\u5e94\u7684\u6587\u4ef6\u62d6\u5230\u5de5\u5177\u9875\u9762\u4efb\u610f\u4f4d\u7f6e\u5373\u53ef\u3002<\/p>\n
\u4f8b\u5982\u4e00\u4e2a\u53ea\u6709’zhangxinxu’\u5b57\u7b26\u5185\u5bb9\u7684txt\u6587\u672c<\/a>\u62d6\u8fdb\u53bb\u53ef\u4ee5\u5f97\u5230\uff1a<\/p>\n
\"\u6587\u4ef6base64\u4fe1\u606f\"<\/p>\n
\u53ef\u4ee5\u770b\u5230\u6587\u4ef6\u7684MIME type\u4e5f\u81ea\u52a8\u8bc6\u522b\u51fa\u6765\u4e86\u3002\u7136\u540ebase64,<\/code>\u540e\u9762\u7684\u5173\u952e\u5185\u5bb9\u6570\u636e\u4f1a\u53d1\u73b0\u548c\u6267\u884cbtoa('zhangxinxu')<\/code>\u7ed3\u679c\u4e00\u6a21\u4e00\u6837\uff0c\u90fd\u662f'emhhbmd4aW54dQ=='<\/code>\uff0c\u80af\u5b9a\u5fc5\u987b\u8981\u4e00\u6837\uff0c\u4e0d\u7136\u6211\u53cd\u800c\u4f1a\u6000\u7591\u81ea\u5df1\u54ea\u91cc\u662f\u4e0d\u662f\u5f04\u9519\u4e86\u3002<\/p>\n
\u6b64\u5de5\u5177\u6211\u7528\u5f97\u5f88\u9891\u7e41\uff0cSVG\u8f6cBase64\uff0c\u5c0f\u5c3a\u5bf8\u56fe\u7247\u8f6cBase64\uff0cWoff\u5b57\u4f53\u8f6cBase64\uff0c\u90fd\u662f\u6587\u4ef6\u5f80\u91cc\u9762\u4e00\u62d6\u5c31\u641e\u5b9a\u4e86\uff0c\u7b80\u5355\u5feb\u6377\u3002<\/p>\n
\u6b64\u5de5\u5177\u4e5f\u662fIE10+\u652f\u6301\u3002<\/p>\n
\u4e94\u3001\u7ed3\u675f\u8bed<\/h3>\n
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